California Natural, L-tryptophan, 30 CapProduct Description Considered as Dietary Supplement Healthy Sleep Patterns USP Pharmaceutical Grade Product Benefits Ingredients Supplement FactsServing Size: 1 CapsuleServings Per Container: 30 Amount Per Serving % DV L Tryptophan 500 mg * **Daily Value (DV) not established. Other Ingredients Cellulose, magnesium stearate, silicon dioxide. Allergen free Suggestions 1 to 4 capsules taken before bedtime, or as directed by a health care professional.